Mt first try with an electric bike. I bought a used electric bike on Craigslist - Cheap Walmart mountain bike with a "Sampson High Power" front wheel motor and a 36 volt/ 20 AH battery, plus controller box and thumb operated throttle. My plan was to move the components onto my old Schwinn tandem, which I have done.
It worked fine for the brief ride I took around the parking lot. On longer rides, here is what happens: If you ride at max power for more than 10 or 20 seconds, it cuts out. If you release the throtttle and reapply it, usually it will work. Sometimes, though, particularly if it ihas cut out a few times already, it won't. But if I unplug it, then plug it back in, it will work.
If I ride at partial throttle, it will run for a pretty long time. But if it is enough pwer to help climb a hill, it cuts out pretty quickly. I had the problem both before and after switching it to the Schwinn.
Any idea what's wrong?